Radiator core



Ap 1935- w. o. EMMONS ET AL 1,998,663

RADIATOR CORE Filed March 25, 1934 fllulief 92. @mzjaui .n, M m

m 6 a d 1 m w Patented Apr. 23, 1935 I I i RADIATOR cons Willard 0.Emmons and Walter R. Ramsaur, Lockport, N. Y., assignors to GeneralMotors Corporation, Detroit, Miclh, a corporation of DelawareApplication March 23, 1934, Serial No. 716,930

3 Claims. (Cl. 257-130) a This invention relates to heat exchangedevices a top tank or inlet header '2, and a bottom tank and concernsstructural details of a cellular type or outlet header 3, adapted forconnection, reradiator core. One of its primary objects is tospectively, with the discharge and intake fittings provide a core whichcompares favorably with of a cylinder block cooling jacket. For the flowof 5 commercial cores now on the market in both eilicooling medium fromone tank to the other the 5 ciency and ease of manufacture, but which isless core is made up of a number of passages 4, spaced complicated indesign, cheaper to produce, and apart by fin strips 5. The fln stripshown in the just as rugged in construction. drawing is of -;corrugatedoutline providing a The invention has to doparticularly with the Iseries of fins 6 extending between adjacent walls 10 formation of wallstrips which are grouped in of the adjoinin tubes t divide e spa e i o10 pairs with their intermediate wall portions spaced a number ofrelatively small air cells and being apart, and their opposite edgesinternested and j in n p apart relation at h ir sides joined together toprovide a passageway for fluid with next succeeding fins throughcomparatively flow. In the preferred embodiment each wall wide bends 1,constituting the peaks or apices of strip contains a longitudinalsuccession of flat e or u Each fi has se louvered 15 main wall portionsextending in a single plane p n 8 to direct, h ir Stream pr iv y withinteriorly projecting head or ridge projecfrom cell to Cell in its P athrough the core, tions therebetween pressed outwardly on transand in rW p Contact of h radiating 11 verse lines so as not to disturb thestraight line face by a maximum number of air particles with flow offluid, and a longitudinal succession of negli i attli o st u ti n f flw. 20 spacer knees along each edge of the strip pressed T two S Walls ofeaeh Water tube D out of the plane of the strip in the direction op-Sage 4 are identical a da nested together w t posite to but intransverse alinement with the eorre5p0nding Parts in ta r d r a ion-Each bead portions. By this arrangement, the strain involves a PreformedStrip os Width dete incident to the stretching of the metal is disminesthe depth of the core As shown in the 25 tributed across the strip on atransverse line, the draw n it i mad up p i c pa y f a l n itudi- UNITEDSTATES PATENT OFFICE stretching of the central part balancing the nalSuccession of fl w P n 9, ll lyin in stretch placedin the edges andstiffening the tube a common Plane and P v di an u obstructedagainstflimsiness while leaving the inner face interior surface. Asuccession of spacer knees practically flat. III are pressed inwardlyalong both edges of the 30 Because a pair of cooperating flat facedstrips Strip in corrugated Outline and these a d P owill provide afreestraight line .flow, the tube J'eetions may he termed Substantially-D with space, when the core is used in an engine cooling rounded Peaksand Valleys- Rounded d o system, for example, may be relatively narrowthe u a turin standpoint, are Pr ra t for the flow of cooling water inathin stream Shari) comers, Since they are easier to form, 35 withoutrunning into conditions sometimes arissult in less die wear a the metali not so i ely ing with plates which are corrugated t produce to tearwhen stretched in the forming operation. turbulence but which restrictthe fiow to the out- The forming dies, which are usually of t e o lettankso that the water may be drawn out of type, may be so constructedthat a he knees 40 the radiator faster than it flows into the core, arepressed out of the plane of the strip o ne 40 causing boiling, and thdelivery of th aerated side, there also will be pressed in transversewater to the cylinder block. With the free flow alinement therewith, aiff nin rib or head ll of water, although in thin streams, steam pocketsacross Strip, but in the pp irec ion or r eliminated and a-moreunjformtemperature outwardly from the wall and between the flat 4 existsbetween the top and bottom of the cylinder p r ions If only the edge p rn w re to be block. Y stretched the unstretched intermediate portion Inthe accompanying drawing, Figure 1 is a, would be too weak for practicalpurposes and the front elevation of a radiator assembly for use onforming of the beads, th r f re, not only ba nc a motor vehicle; Figure2 shows in perspective a for he Stretching f the edges, u l d ri id yfragment of the core; Figure 31s a transverse secto the wall withoutinterfering or bailling the flow 50 tion of one of the water tubes, andFigure 4 is a through the tube. vertical section through a portion ofthe core. To further compensa f the Stretching o h Referring to thedrawing, the radiator assemedge portions, reversely pressedsemi-spheroidal bly, as will be readily understood, includes a heatrroie tions I! a o m d i t wa im ediatee dissipating unit or core I,having at opposite ends 1y adjacent the knees, and these-serve tolocate55 between one another the curved peaks I of the fin strip. They alsoassist in the assembly of the core by providing inclined centering andguiding surfaces on which the fins ride to final seating position. As anoptional detail a central series of spacer knees l3 may be provided toguard against inward collapse of the tube, particularly if the core, isof great depth.

We claim: u.

1. A radiator core having a series of spaced fiuid passages withcorrugated fin strips therebetween, each passage comprising a pair ofcomplementary plates arranged face to face and joined along their edgesand each plate being formed from a fiat strip with a series oflongitudinally spaced and relatively narrow line depressions extendingoutwardly therefrom and defining therebetween a succession of fiat wallportions projecting in a common plane and inwardly extending ofisets ofsubstantially V-shape, in the opposite edge portions, the peak of eachinward ofiset being rounded and in transverse alinement with one of saidoutward line depressions and adapted to nest in staggered relation withthe ofiset edge portion of the complementary plate, and a longitudinalsuccession of rounded embossments pressed outwardly adjacent and intransverse alinement to said inwardly offset portions for locating thecorrugated fin strip.

2. In a radiator core, a series of nested plates, each having oppositeedge portions stretched at regular intervals throughout its length toprovide a continuous succession of spacer knees projecting from theplane of the plate on one side thereof, with the knees along one edge intransverse alinement with those along the other edge, and having itsintermediate portion stretched at spaced intervals coinciding with thoseabove mentioned to provide spaced narrow ridges in ,transverse alinementwith the knees but projecting out of the plane of the plate on the otherside thereof, with portions between said narrow ridges and throughoutthe major extent of the plate undisturbed in the plane of the plate toafford a substantially fiat wall.

3. In a heat transfer unit, a series of spaced apart fluid flow tubes,each providing a substantially straight uninterrupted passageway andcomprising a pair of spaced wall strips joined and sealed at oppositeedges, each strip having between its edge portions a longitudinalsuccession of relatively wide fiat wall portions extending in a singleplane and separated one from another by relatively narrow transverseridges pressed outwardly from said plane, and in each edge portionintransverse alinement with said ridges, a longitudinal succession ofinwardly pressed spacer knees internesting with complementary knees ofthe mating wallstrip.

WILLARD O. EWONS. WALTER R. RAMSAUR.

